"Sixth and hopefully the final Lumbar Injection (spinal tap) in this Chemo treatment!" Miller captioned the clip.
"This is my, I hope to God, final lumbar injection," Miller explained while filming the inside of the room before her procedure, which she explains in great detail. "This is the table. They're going to put me on my stomach and then my arms are underneath me so I can't move. And then they twist [your back] on a diagonal so that you're spinal fluid goes down into your spinal cord, lower."
Miller recently revealed that she was "on the mend" after undergoing another spinal surgery last month and following several treatments for Burkitt lymphoma, which is a form of non-Hodgkin's lymphoma, a cancer that affects the lymphatic system. Burkitt lymphoma starts in antibody-producing B cells, which are part of the immune system.
"She's not 100 percent there yet but she is doing good," Siwa, 15, explained after having spoken with Miller just days earlier. "She’s going through therapy, she's going through all the things that she needs to be going through, chemo obviously. [I] think she only has one or two more rounds of chemo, so that’s really, really good for her but she's happy, she's in good spirits."
Siwa also revealed that Dance Moms is documenting some of Miller's treatment in order to help fans understand "what's actually going on right now."
Check out the video below to hear more from the young star about how this experience has changed Miller's outlook on life.